Receiver for sound-transmitting instruments.



ITTING INSTRUMEN APPLIUATION FILED MAR. 4-. 190?.

Patented Apr. 12, 1910.

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UNITED sTATEs PATENT oEEioE.

JOI-IN J. COMER, OF SANTA MONICA, CALIFORNIA, ASSIGNOR TO i BALTIMORE, MARYLAND.

GEORGE R. WEBB, or

RECEIVER EUR SOUND-TRANSMIZITING INSTRUMENTS.

Specicaton or Letters Patent.

Patented Apr. 12, 1910.

Application filed March 4, 1907. Serial No. 360,479.

To all whom t may concern: l

Be it known that I, JOHN J. COMER, a citizen of the United States, residing at Santa Monica, in the county of Los Angeles and State of California, have invented cer tain new and useful Improvements in Receivers for Sound-Transmitting Instru- .inents; and I do declare the following to be a full, clear, and exact description of t-he invention, suoli as will enable others skilled in the art to which it appei'tains to make and use the same, reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which form a part of this specification.

My invention relates to receivers for sound transmitting instruments, and is de -then sought to be clearly defined by the claims, Areference being had to the accom'- panying drawing which shows one. form or embodiment of the invention, and in which- Figure l is a side elevation, partly' in section, of the receiver, and Fig. 2 a plan view thereof. l v Y In the drawing, the numeral 1 represents a base carrying a ring 2 within which is a diaphragm 3, preferably of mica, and having rubber o r cushioning rings 4; near its periphery on opposite faces thereof.

The numeral 5 designates a thinv steel lever having one end suitably attached by wax, or otherwise, to the diaphragm 3,' and the other end secured to an armature which at one point rests upona knife-edge bearing 7 formed on one core 8 of an electromagnet 9 which is supported by its cores 8 and 10- ermanent magnet 11 which in the from a form il ustrated is a horse-shoe ma et. The rear end of the lever 5 is connected y a lyielding non-metallic suspension means 12 to a spindle 1 3 mounted in this instance in a post 14 which may be split so as to frictionally hold the spindle at any oint in'its rotation which may be effected y a thumb nut 15. The pur ose of this `suspension is to normally hol theH armature awayfrom one' pole piece .of the magnet and to relieve the diaphragm from strain while in its normal position. By having the armature rest upon one of the pole pieces only one air space between the armature and the ole of the magnet is formedl and by the lnufe-edgc bearing on the other pole-piece a better magnetic circuit is obtained, and the vibrations through the lever to the diaphragm are renderedmore sensitive so that greater volume, and a urer and truer tone are obtained. The ad- Justment of the armature with relation to the pole of the magnet to the slightest degree desired is also made possible by the adjustable suspension means employed.

I have illustrated the invention in substantially the form in which it has been used up to the present' time but without meaning to restrict the invention to such form.

Having described my invention and set forth its merits, what I claim is 1. A receiver comprising a diaphragm and means for amplifying the received vibrations, said means comprising a leverhaving one end connected with the diaphragm to move it back and forth and supported to relieve the diaphragm of its wei ht in the normal position of the lever an amplify the received vibrations by amplifying the movement of f the diaphragm, electrically actuated means for actuatingv said lever, and

vmeans to relieve `the diaphragm of mag-- netic strain transmitted through said lever when in normal described.

' 2. A receiver comprising a dia hragm, a lever connected at one end to the diaphragm position, substantially as' to move it backl and forth and supported upon a knife-edge fulcrum 'so as torelieve the diaphragm of the Weight of the lever in its normal posit-ion and amplify the move-A ment of the diaphragm to amplify the received vibrations, an. electro-magnet for -actuating said lever, and means for relieving thel diaphragm of magnetic strain transmitted through the lever when in normal position, substantially as described.

3. A receiver comprising a diaphragm, an electro-magnetan armature having a'bearing-on one pole of the magnet and carryin a v lever one end of which lis connected with said diaphragm to move it both back and forth, su stantially as described.

4. A receiver comprising a di'aphra ,van electro-magnet, an armature supporte upon the magnet to leave a single air space belos 'both back and tween the armature and core offlthe magnet, and a lever carried by the armature and connected With the' diaphragm to move it ferth, substantially as described.

5.' A receiver'comprising a diaphragm, a magnet, a fulcrumed armature carrying a lever connected with the diaphragm tomove it lboth backand forth, and means for suspending` the armature to relieve the diaphragm of, the magnetic strain transmitted through the lever when in normal position, substantially as described. l

G. A receiver comprising a diaphragm, a

magnet, a fulcrumed armature carrying a lever connected with the diaphragm tomove.

it both back and forth, and means for adjnsting the armature with relation to the magnet, substantially as described.

7. A receiver comprising a diaphragm, a

1nagnet a fulcrumed armature carrying a lever connected With the diaphragm-to move it both back and forth, a. yielding suspension for the armature, and means for ad- `ustin0l the armature With relation to the magnet through said yielding suspension substantially as described. 4 8. In a telephone instrument. a receiving electro-magnet having permanently magnetizedcores; an armature in the magnetic -eldthereof and lying in contact4 Withone an .armature in contact With one polar ex tremity'of said electromagnet, and extending past the other polar extremity thereof, belngseparated therefrom by a small air gap; 'and a diaphragm parallel to and rigidly connected with said armature, substantially as described.

10. In a telephone instrument, the combi- I nation with an electro-magnet, of an armature 1n contact With the core of one coil thereof and extending past, but not in contact with, the core of the other coil, said armature having a substantially rigid extended nortion beyond the field of the electro-magnet, and a diaphragm parallel to said extended portion and rigidly connected at the center therewith.

In testimony whereof I aiix my signature in presence of two Witnesses. v

JOHN J. COMER. Witnesses JOSEPH A. COMER, FRED JABEZ COMER. 

